Replace an overheated or corroded blower speed resistor and its connector in one job with the Dorman HVAC blower motor resistor kit, part number 973-412, which pairs a new resistor with a harness pigtail. It fits many vehicles, among them the 1987-1996 Ford F-150, 1987-1996 Ford F-250 and 1991-1994 Ford Explorer. See the "Vehicles it fits" section for the full list and engine details.
The blower motor resistor controls how much power reaches the blower motor, which gives the blower fan its lower speed settings. If the original resistor overheats or corrodes, the fan may lose some or all of those speeds. The catalog lists this kit for front and rear positions, depending on the application.
- Direct replacement: this resistor and harness kit directly replaces the original equipment on the listed applications.
- Resistor plus pigtail: every kit includes both a resistor and a harness pigtail, which most repairs call for.
- Built to perform like the original: designed to work like the original equipment so the HVAC blower can operate as intended.
- Engineering support: backed by a team of engineers and quality specialists in the USA.
If a failed resistor is behind your fan speed problem, this Dorman blower motor resistor replaces it, and the kit replaces the connector too. Confirm the diagnosis first, because a faulty switch, motor or wiring can cause similar symptoms.
Interchange: BMR036 · 3A1124 · RU1013 · 4C2Z19A706BA · E7TZ19A706A · 20261 · RU318 · JA1176
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
BMR036, 3A1124, RU1013, 4C2Z19A706BA, E7TZ19A706A, 20261, RU318, JA1176
Frequently Asked Questions
What does this Dorman blower motor resistor kit do?
It sets the blower fan speeds by limiting the power sent to the blower motor at the lower settings. The kit replaces an overheated or corroded original resistor and includes a new harness pigtail.
What comes in the box?
Each kit includes a blower motor speed resistor and a harness pigtail. Most repairs call for both parts.
Does it fit the 1987-1996 Ford F-150?
Yes. The 1987-1996 Ford F-150 is one of the listed applications, and so is the 1987-1996 Ford F-250. Check the "Vehicles it fits" section to confirm your exact vehicle.
What are signs the blower motor resistor may need replacing?
Signs include a blower fan that runs on some speed settings but not others, or does not run at all on certain settings. Diagnose first, because a switch, motor or wiring fault can cause similar symptoms.
How does the kit install?
It directly replaces the original equipment on the listed applications. Follow your vehicle's service information to remove the old resistor and connect the new harness pigtail.
